Effluent Disposal Scheme Report

Effluent Disposal Scheme Report

1. Topsoil

   • pH: Range 6.6-8.3. Neutral to slightly alkaline. (7-7.7 prev.)
   • EC: general low (same as prev.)
   • Nitrate: below detection limit (5mg/kg). Except LOT10 (100mg/kg)
   • Ammonia: below detection limit (5mg/L)
   • Phosphorous: 95-350mg/kg. Lot 6B MAX. (<10-320mg/kg prev.)
   • Exchangeable Cations: generally lower than the subsoil

2. SubSoil

   • pH: similar to topsoil but more towards the alkaline range
   • EC: generally increased from previous
   • Nitrate below detection limit (5mg/kg)
   • Ammonia: generally below detection (5mg/kg). Except LOT7 7.9mg/kg)
   • Phosphorous: <10-43mg/kg. (<10-56 prev.)
   • Exchangeable Cations: generaly higher than soptsoil

3. Soil Trends

   • pH
     • No prevailing trend but subsoil fluctuates more than topsoil
   • EC
     • Gradual increase in topsoil gradual decrease in subsoil. LOT10 significant increase in topsoil
   • Phosphorous
     • Generally below LOR (100) in subsoil. Topsoil similar to previous year
   • Nitrate
     • Gradual decrease in Topsoil and subsoil
   • Exchangeable Cations
     • were increasing in topsoil but lower this year. Subsoil generally consistant with historical data

4. Effluent

   • pH 8.5-9.2 (8.1-9.5 prev)
   • EC 720-1000 uS/cm (58-1500 prev)
   • Nitrate: Below detection limit <0.02-1.6mg/L (0.02-2.8 prev)
   • TKN 0.7-1.7 mg/L ( 0.5-2.3 prev)
   • BOD below detection (same as prev)
   • Total Phosphorous: 4.1-8.3 mg/L (2.9-7.8 prev)
   • TRENDS
     • pH increasing
     • EC generally similar
     • TSS remain loa
     • Nitrate continue to decreasae
     • TKN fluctuates but remain below 9mg/l since Mrch 2011
     • BOD remains low
     • Total Phosphorous generally decreasing

5. Ground Water

   • Standing Water Levels (SWL) generally similar
   • pH 6.6-7.8 Neutral similar to previous (6.8-9.1)
   • EC 5.9-26.0 uS/cm range to low to very high (2.0-27 prev)
   • Nitrate 0.11-22mg/L. Trigger level breached (0.07-28 prev)
   • TRENDS
     • SWL similar
     • pH similar
     • Nitrate similar
     • EC fluctuates but similar to historic